Of course, that might be a bit too kiddish for the teenagers. I'm not sure. Again, good luck!

scarlet - 10:49am Jan 30, 2004 PST(#3 of 6)
Some days I just want to be a MISSING PERSON

For that many, I would suggest more of a treasure hunt than an actual mystery. You can have them in small teams and give them word problems, visual clues, directions, even have them gather specific items to present at the end.